But because of bitcoin mining, it has already exceeded the allotted amount of hydropower in December and January, reported Bloomberg, citing a local newspaper. Some residents have complained that their electricity bills have increased by as much as $ 300, noted the report. The city council said it …Google Alert – bitcoin

Coinbase says at 11:11 a.m. ET that "all buys and sells have been temporarily disabled." The interruption in service comes as bitcoin briefly tumbled below $ 11,000, down 44 percent from its record high hit Sunday. On Thursday, Coinbase had temporarily disabled buys and sells at 5:57 p.m. ET, …Google Alert – bitcoin

Could a malicious actor (e.g. government) attack the network by introducing significant compute power into the network, and once the difficulty grows very high, withdraw all resources from the network.

This could dramatically increase the time it takes for transactions to be confirmed, as well as makes it not profitable for other miners. Granted this would only last until the difficulty is readjusted, but perhaps it could be enough to shake public confidence in the network.